Deductions & credits

I was a dependent on my parents return in 2020.  This is the first return I am completing as not being a dependent and I have noted when asked that I have no dependents and I personally have never received any Advance Child Tax Credit Payments.  Form 8812 is asking how much I received on letter 6419 and I have never received letter 6419.  Placing a zero on Form 8812 seems to be the only way the TurboTax software will let me proceed.